Why do you think so many young Americans became so vocal in their condemnation of the Vietnam War?

Young Americans were disillusioned with the policies of the country.

Explanation:

The young Americans in the 60s had grown up in a prosperous but conservative country where the cracks in the common society were beginning to show rather glaringly in the end of the term of the decade.

When the war was televised this generation that was well educated and liberal saw the atrocities being done in the war which was seen as needless, they went against it.

The angst got itself into a real movement which was a result of the mass disillusioning of the young America with the old.